为什么看到锯齿状曲线？ [英] Why do I see this jagged curves?

问题描述

我有一个使用以下代码绘制画布并绘制曲线的代码：

I have a canvas and draw curve with this code:

using (Graphics g = Graphics.FromImage(canvas.BackgroundImage))
{
    g.DrawCurve(pen, points);

points 是我填写的数组鼠标位置点。
结果是我看到一些没有画出的锯齿状线。

points is array that I fill that by mouse location points. In the result I see some jagged lines that I didn't draw.

您可以在这里看到它们（红色矩形）：

You can see them here(in red rectangles):

我该怎么办？

推荐答案

您看到的是默认的组合有点不幸。 microsoft.com/en-us/library/system.drawing.pen.linejoin%28v=vs.110%29.aspx rel = nofollow> Linejoin ，它是 Mitre 和默认值，用于 MiterLimit ，即10。

What you is see is the somewhat unlucky combination of the default for Linejoin, which is Miter and the default for MiterLimit, which is 10.

相反，您可以选择其他 LineJoin 个选项之一，也可以选择减少 MiterLimit 说少些一半 Pen.Width ..

Instead you have a choice of either picking one of the other LineJoin options or reducing the MiterLimit to say less than half the Pen.Width..

using (Pen myPen = new Pen(Color.Blue, 24f))
{
    // either another LineJoine;
    myPen.LineJoin = System.Drawing.Drawing2D.LineJoin.Round;
    // or a reduced MiterLimit:
    myPen.MiterLimit = 1+ myPen.Width / 5f;
}

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